JPH0645941B2 - Structural foundation method - Google Patents
Structural foundation methodInfo
- Publication number
- JPH0645941B2 JPH0645941B2 JP61058643A JP5864386A JPH0645941B2 JP H0645941 B2 JPH0645941 B2 JP H0645941B2 JP 61058643 A JP61058643 A JP 61058643A JP 5864386 A JP5864386 A JP 5864386A JP H0645941 B2 JPH0645941 B2 JP H0645941B2
- Authority
- JP
- Japan
- Prior art keywords
- foundation
- foamed plastic
- plastic body
- pile
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Foundations (AREA)
Description
【発明の詳細な説明】 （発明が属する技術分野） 本発明は、発泡プラスチック体を使用する構造物基礎工
法に関するものである。Description: TECHNICAL FIELD The present invention relates to a structural foundation construction method using a foamed plastic body.
（発明の課題とその特徴点） 構造物の基礎の形式には大きく分けて杭基礎と直接基礎
がある。(Problems of the invention and their characteristic points) There are roughly two types of foundations for structures: pile foundations and direct foundations.
杭基礎は近来、長尺・大型化の傾向にあるが、埋立地に
代表されるような支持層が非常に深い場合には、コスト
高につながるため止むを得ず、途中の中間砂層に支持さ
せる不完全支持杭としたり、摩擦杭を採用することがあ
り、この場合には杭の支持力不足とか沈下の問題が生じ
てくる。Pile foundations have tended to be long and large in recent years, but if the support layer, such as a landfill, is very deep, it will inevitably lead to higher costs and will be supported by an intermediate sand layer on the way. In some cases, incompletely supported piles are used or friction piles are used. In this case, problems such as insufficient bearing capacity of the piles and settlement will occur.
また、直接基礎においても、最近、排土重量と建屋荷重
との荷重バランスを計るフローティング基礎工法が採用
されつつあるが、これも掘削深さが大になるとコスト高
になるし、掘削深さを節減すると沈下の問題が生じてく
る。Also for direct foundations, recently, a floating foundation method is being adopted that balances the weight of excavated soil and the load of the building, but this also increases the cost and increases the excavation depth. Savings will cause settlement problems.
ところで、球状発泡スチロールを主骨材として用いた軽
量スチロールコンクリート製のフロートユニットを結合
して大面積の浮上構築物を構成して、該浮上構築物に作
用する浮力で有効鉛直荷重を軽減させる技術は公知（特
開昭53−69434号公報参照）であるが、この公知例の浮
上構築物は水上に浮かぶ人工地盤ともいうべきもので、
通常の基礎の概念から外れているものである。By the way, a technology for reducing the effective vertical load by the buoyancy acting on the floating structure by combining a float unit made of lightweight styrene concrete using spherical styrofoam as a main aggregate to configure a large area floating structure is known ( JP-A-53-69434)), the floating structure of this known example should also be called artificial ground floating on the water,
It deviates from the usual basic concept.
本発明は、発泡プラスチック体を用いて従来の杭基礎や
直接基礎における前述の問題点を解消するようにした新
規構想の構造物基礎工法を提供することを目的とし、そ
の構成上の特徴は特許請求の範囲に記載したとおりであ
る。An object of the present invention is to provide a structural foundation construction method of a new concept that solves the above-mentioned problems in conventional pile foundations and direct foundations by using a foamed plastic body, the structural features of which are patents. As described in the claims.
本発明で用いる発泡プラスチック体は、既成形のものと
現場成形のものの何れでもよく、発泡プラスチック材の
廃物利用も可能である。The foamed plastic body used in the present invention may be a preformed one or an on-site molded one, and a waste plastic foam material may be used.
また、発泡プラスチックの種類も任意であるが、最近各
分野で多用されている発泡スチロールは、趙軽量（密度
が0.02〜0.04t/m3）で吸水率も小さい（10％以下）の
で、最も好ましい。Also, the type of foamed plastic is arbitrary, but Styrofoam, which has been widely used in various fields recently, is most preferable because it is lightweight (density of 0.02 to 0.04t / m 3 ) and has a low water absorption rate (10% or less). .
（図面による発明の具体的説明） 図面に本発明の各種適用例が示されているが、第１図と
第２図は水底地盤に設けた杭基礎の場合、第３図〜第５
図は地下水位の高い地盤に設けた直接基礎の場合であ
る。(Specific description of the invention with reference to the drawings) Various application examples of the present invention are shown in the drawings, but Figs. 1 and 2 show the case of a pile foundation provided on a submerged ground, Figs.
The figure shows the case of a direct foundation installed on the ground where the groundwater level is high.
第１図と第２図において、１は橋脚本体、２はフーチン
グ、３は杭体、４は発泡プラスチック体である。1 and 2, 1 is a pier main body, 2 is a footing, 3 is a pile body, and 4 is a foam plastic body.
第１図の場合は、杭体３が鋼管製で、発泡プラスチック
体４を杭体３の内部空間の上部に適宜高さに亙って設け
ている。In the case of FIG. 1, the pile body 3 is made of steel pipe, and the foamed plastic body 4 is provided above the inner space of the pile body 3 at an appropriate height.
この構造物の水面下に入る部分には浮力が作用し、特に
発泡プラスチック体４は軽いので、その浮力によって大
きな上向きの力が発生し、その分、基礎を介して地盤に
伝達される構造物全体の鉛直荷重が軽減されるが、この
際、発泡プラスチック体４の浮力がフーチング２の底面
に作用するようになっていても、又は杭体３にその鉛直
支持力を増加させる形で作用するようになっていても、
同じことである。Buoyancy acts on the portion of the structure below the water surface, and since the foamed plastic body 4 is particularly light, a large upward force is generated by the buoyancy, and the structure is transmitted to the ground through the foundation by that amount. The overall vertical load is reduced, but at this time, even if the buoyant force of the foamed plastic body 4 acts on the bottom surface of the footing 2, or it acts on the pile body 3 in a form of increasing its vertical support force. Even though
Same thing.
第２図の場合は、発泡プラスチック体４をフーチング２
の下に適宜厚さで杭体３の上端部を包むようにして設け
ている点が第１図の場合と異なっており、この場合は杭
体３は中空でなくてよい。In the case of FIG. 2, the foaming plastic body 4 is attached to the footing 2
1 is different from the case of FIG. 1 in that it is provided below the pile so as to wrap around the upper end of the pile body 3, and in this case, the pile body 3 need not be hollow.
次に、第３図〜第５図において、５は建屋、６は基礎ス
ラブである。Next, in FIGS. 3-5, 5 is a building and 6 is a foundation slab.
第３図の場合は、基礎スラブ６の下に適宜厚さで発泡プ
ラスチック体４を層状に設け、この発泡プラスチック体
４の地下水位以下にある部分に作用する浮力で基礎を含
む構造物全体の鉛直荷重を軽減させている。In the case of FIG. 3, the foamed plastic body 4 is provided in layers under the foundation slab 6 with an appropriate thickness, and the buoyancy acting on the portion of the foamed plastic body 4 below the groundwater level causes the entire structure including the foundation. The vertical load is reduced.
第４図の場合は、基礎スラブ６の周辺を地中梁７で囲
み、その内方に発泡プラスチック体４を設けている点が
第３図の場合と異なる。The case of FIG. 4 is different from the case of FIG. 3 in that the foundation slab 6 is surrounded by an underground beam 7 and the foamed plastic body 4 is provided inside thereof.
第５図の場合は、基礎スラブ６の下に発泡プラスチック
体４を杭状若しくは壁状に設けている点が第３図の場合
と異なる。The case of FIG. 5 is different from the case of FIG. 3 in that the foamed plastic body 4 is provided below the foundation slab 6 in a pile shape or a wall shape.
以上の各適用例における発泡プラスチック体４に既成形
のものを用いる場合は、適宜大きさのブロックにして現
場に運び込み、所定位置で所定形状に組み立てるが、第
１図と第４図の場合は粒状のものを用いて単に充填する
だけでもよい。When the molded plastic body 4 used in each of the above application examples is an already molded one, the block is appropriately sized and carried to the site and assembled in a predetermined shape at a predetermined position. In the case of FIGS. 1 and 4, It may be simply filled with a granular material.
又、発泡プラスチック体４を現場成形する場合は、通常
は所定位置に型枠を設置してその内部に発泡プラスチッ
ク材を注入するが、第１図と第４図の場合は杭体３と地
中梁７をそれぞれ型枠代わりにすることができる。Further, when the foamed plastic body 4 is to be molded on site, usually a mold is installed at a predetermined position and the foamed plastic material is injected into the mold, but in the case of FIG. 1 and FIG. Each of the middle beams 7 can be used as a formwork.
（発明の効果） 本発明は以上のようなものであって次のような諸効果が
期待できる。(Effects of the Invention) The present invention is as described above, and the following various effects can be expected.
発泡プラスチック体に作用する極めて大きな浮力で基礎
を含む構造物全体の有効鉛直荷重を大幅に軽減すること
ができ、杭基礎においては杭長、杭径等の杭仕様の低減
が、又、直接基礎においては掘削深さの低減が、それぞ
れ、構造物の沈下を伴わないで可能となる。発泡プラス
チック体を地盤中で用いることにより、発泡プラスチッ
ク体の設置に別途取り付け部材等の必要がなく、また、
発泡プラスチック体の破損の恐れも少ない。発泡プラス
チック体の使用量の増減により鉛直荷重の軽減量を容易
に調節できる。With the extremely large buoyancy acting on the foamed plastic body, the effective vertical load of the entire structure including the foundation can be significantly reduced. In the pile foundation, the pile specifications such as the pile length and the pile diameter can be reduced, and the direct foundation can also be reduced. In each case, the depth of excavation can be reduced without the subsidence of the structure. By using the foamed plastic body in the ground, there is no need for a separate mounting member for installing the foamed plastic body, and
There is little risk of the foamed plastic body breaking. The amount of vertical load reduction can be easily adjusted by increasing or decreasing the amount of foamed plastic used.
図面は本発明の適用例の説明図であって、第１図と第２
図は水底地盤に設ける杭基礎の場合、第３図〜第５図は
地下水位の高い地盤に設ける直接基礎の場合である。 １：橋脚本体、２：フーチング、３：杭体、４：発泡プ
ラスチック体、５：建屋、６：基礎スラブ、７：地中
梁。The drawings are explanatory views of application examples of the present invention, and include FIG. 1 and FIG.
The figure shows the case of a pile foundation installed on the water bottom ground, and Figs. 3 to 5 show the case of a direct foundation installed on the ground where the groundwater level is high. 1: main body of pier, 2: footing, 3: pile body, 4: foamed plastic body, 5: building, 6: foundation slab, 7: underground beam.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松下 正憲 東京都台東区台東１丁目２番１号 不動建 設株式会社内 (72)発明者 池谷 健勇 東京都台東区台東１丁目２番１号 不動建 設株式会社内 (72)発明者 三阪 一磨 東京都台東区台東１丁目２番１号 不動建 設株式会社内 (56)参考文献 特開 昭53−69434（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Matsushita 1-2-1, Taito, Taito-ku, Tokyo Within Fudo Construction Co., Ltd. Fudo Construction Co., Ltd. (72) Inventor Kazuma Misaka 1-2-1, Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd. (56) Reference JP-A-53-69434 (JP, A)
Claims (1)
しくは地下水位以下の地盤中に入る部分に発泡プラスチ
ック体を用い、該発泡プラスチック体に作用する浮力で
基礎を含む構造物全体の有効鉛直荷重を軽減させること
を特徴とする構造物基礎工法。1. A foamed plastic body is used in a portion of a pile foundation of a structure or a direct foundation that enters the water bottom ground or the ground below the groundwater level, and the entire structure including the foundation is buoyant by the buoyancy acting on the foamed plastic body. A structural foundation method characterized by reducing the effective vertical load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61058643A JPH0645941B2 (en) | 1986-03-17 | 1986-03-17 | Structural foundation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61058643A JPH0645941B2 (en) | 1986-03-17 | 1986-03-17 | Structural foundation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62215727A JPS62215727A (en) | 1987-09-22 |
| JPH0645941B2 true JPH0645941B2 (en) | 1994-06-15 |
Family
ID=13090260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61058643A Expired - Lifetime JPH0645941B2 (en) | 1986-03-17 | 1986-03-17 | Structural foundation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0645941B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008101379A (en) * | 2006-10-18 | 2008-05-01 | Railway Technical Res Inst | Support structure for construction foundation and construction method |
| JP2014070893A (en) * | 2013-10-31 | 2014-04-21 | Sekisui Chem Co Ltd | Structure for installing equipment for building |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03144017A (en) * | 1989-10-30 | 1991-06-19 | Nishi Nippon Eng Kk | Holding structure for embedded concrete block |
| JPH03253619A (en) * | 1990-03-05 | 1991-11-12 | Seiko Kogyo Kk | Underground light-weight column and its foundation construction |
| JP4744731B2 (en) * | 2001-07-04 | 2011-08-10 | 清水建設株式会社 | Ground-isolated structure using soft ground |
| JP4585987B2 (en) * | 2006-04-14 | 2010-11-24 | 佐藤 実 | Building basic structure |
| JP2011117279A (en) * | 2011-02-07 | 2011-06-16 | Shimizu Corp | Foundation base isolation structure using soft ground |
| JP6273771B2 (en) * | 2013-10-29 | 2018-02-07 | Ｊｆｅエンジニアリング株式会社 | Foundation structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5369434A (en) * | 1976-12-03 | 1978-06-20 | Kurokawa Kishiyou Kenchiku Tos | Method of building floating construction on water and sea |
-
1986
- 1986-03-17 JP JP61058643A patent/JPH0645941B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008101379A (en) * | 2006-10-18 | 2008-05-01 | Railway Technical Res Inst | Support structure for construction foundation and construction method |
| JP2014070893A (en) * | 2013-10-31 | 2014-04-21 | Sekisui Chem Co Ltd | Structure for installing equipment for building |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62215727A (en) | 1987-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |